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Article:

Job Postings: What They Say vs. What They Mean

"We have an immediate opening for..."

Job openings rarely coincide with your being in the right place at the right time. Assuming you're qualified, ask: "Why didn't you contact me first?" and "Why the urgency? Why now?"  

Do multiple openings mean they don't plan for success, yours or theirs?Ask. You'll rarely get the unvarnished truth but it beats missing all together what the posting probably glosses over.